On 20/07/2010 2:11 PM, Jim Maas wrote:
I found a form of the if statement that works but it is very long. I'm
attempting to check the value of of two different variables to see if
they evaluate to either of two different values, which will result in a
division by 0 in the final equation. This first if statement works for me
_______
if ((x0.trial01 == 0.0)||(x0.trial01 == npt01)||(x1.trial01 ==
0.0)||(x1.trial01 == npt01))
{
x0.trial01.in <- x0.trial01 + 0.5
x1.trial01.in <- x1.trial01 + 0.5
npt01.in <- npt01 + 1.0
}
else
{
x0.trial01.in <- x0.trial01
x1.trial01.in <- x1.trial01
npt01.in <- npt01
}
__________
I've tried
if ( ( x0.trial01 || x1.trial01) == ( 0.0 || npt01) )
......
but it doesn't seem to work correctly. Is there a simpler way to check
two variables for two different valuables?
I would probably use your original one, formatted to make the repetition
clear, e.g.
if ( (x0.trial01 == 0.0)
||(x0.trial01 == npt01)
||(x1.trial01 == 0.0)
||(x1.trial01 == npt01))
but if you really want less repetition, you could go with this:
if ( length( intersect( c(x0.trial01, x1.trial01), c(0.0, npt01) ) ) > 0 )
Doesn't look clearer to me, but it fits on one line....
Duncan Murdoch
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